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sum_lecture05

# sum_lecture05 - upon the medium in which the wave...

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The Physics of Light & Sound The Pendulum & Properties of Waves Drs. Paulson and Scully GSCI 121 Summer

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The Pendulum In the case of the pendulum system , the restorative force is gravity . Energy changes between potential and kinetic : T = 1 f = 2 π l g
A wave is a disturbance or variation which travels through a medium. The wave speed depends on the medium. Particles in the medium do NOT travel with the wave . Waves transfer energy (but not matter) from a place to another and can do work. Properties of Waves

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A transverse wave , such as light or waves on a string, oscillates in a direction perpendicular to the direction the wave is traveling. A longitudinal wave , such as a sound wave or shock wave, oscillates in the same direction as the wave is traveling. Properties of Waves
We can characterize waves with three properties which are the wavelength , frequency and wave speed . Properties of Waves λ f = c Wavelength λ Frequency f Wave Speed c Energy=E ~ A 2

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The speed of the wave depends upon the medium

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Unformatted text preview: upon the medium in which the wave propagates. • The speed of sound , for example, is faster the denser the medium. • The speed of sound in air also depends on the temperature (in Celsius) as: Properties of Waves v = 331 + 0.6 T C m/s Properties of Waves • The speed of light (in a vacuum) is 3 x 10 8 m/s. It is slower in other media. • The speed of waves on a string depend on the string tension T and mass per unit length μ . • What happens when we combine more than one wave? The principle of superposition says we just add the amplitudes directly to find the resultant wave. Superposition • The phase of one of the waves could be different from the other. Phase is the angle within the cycle that one trails or leads the other Superposition y = A sin( ϖ t + ϕ ) • When waves are completely out of phase (that is they differ by 180 or π radians), they may completely cancel! Superposition...
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sum_lecture05 - upon the medium in which the wave...

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